I’m going nuts over something seemingly simple.
I want to run a script every minute which reboots when it finds something in a log.

It simply does not run via cron.

My script in /home/root/resetiferror.sh

!/bin/bash

tail -fn0 /var/log/messages | while read line ; do
echo "${line}" | grep -i "failed to read" >> /var/log/resetiferror
if [ $? = 0 ] ; then
echo "$(date) found so restart" >> /var/log/resetiferror
/sbin/reboot
fi
done

This is my crontab:

1 * * * * timeout 5s /home/root/resetiferror.sh >> /var/log/resetiferror.log 2>&1

I made it executable
It DOES work with

/bin/sh -c "(export PATH=/usr/bin:/bin; /home/root/resetiferror.sh </dev/null >/dev/null 2>&1)"